single layer of thin and flattened cells; found in air sacs in lungs, lining of blood vessels
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simple cuboidal epithelium
Single layer of cube shaped cells. Found in kidney tubules, ovaries, and ducts of certain glands.
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simple columnar epithelium
single layer of elongated, rectangular shaped cells; found in surface lining of stomach and intestines.
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pseudostratified columnar
odd shaped elongated, rectangular cells that each come into contact with the basement membrane; may contain cilia. Found in the cells of the respiratory system.
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stratified squamous epithelium
layers of thin and flattened cells; found in surface of skin and upper digestive tract lining (mouth, esophagus)
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transitional epithelium
Multiple layers of cells which appear cuboidal when not stretched, but squamous when stretched; found in the urinary organs
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simple squamous (diagram)
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stratified squamous (diagram)
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simple cuboidal (diagram)
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simple columnar
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pseudostratified ciliated columnar
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transitional epithelium
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epithelial tissue
Sheets of cells that covers the surfaces of the body, line internal cavities, and form certain glands.
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avascular tissue
characteristic of epithelial tissue; no blood vessels connected to it
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basement membrane
the basal lamina connected to underlying connective tissue; located below layers of epithelial cells
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endocrine glands
release hormones; have no ducts or contact to the exterior of the body. ex: pituitary, thyroid, and adrenals.
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exocrine glands
produce secretions; open to exterior of body through ducts. ex: sweat and oil